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Online since: May 2011
Authors: Marzieh Kadivar, Mehdi Kadivar, Kazem Barkhordari
Investigation of Soil Nanostructure by Electron Microscopes
Understanding materials’ nature and their structures has been always of much significance.
Microscopic structure of fine soils can be used as an index to identify the type of environmental processes and estimating its resistance [5].
The question is that how soil structure can be observed in this small scale.
TEM uses electron emission towards the specimen, similar to SEM; however, in TEM the emitted electrons pass through the specimen and reach a phosphorous detector so as to provide a pattern of specimen’s structure [12].
Krammer: Application of atomic force microscopy to particle sizing, Fresenius’ Journal of Analytical Chemistry 363 (4) (1999) 323– 332
Microscopic structure of fine soils can be used as an index to identify the type of environmental processes and estimating its resistance [5].
The question is that how soil structure can be observed in this small scale.
TEM uses electron emission towards the specimen, similar to SEM; however, in TEM the emitted electrons pass through the specimen and reach a phosphorous detector so as to provide a pattern of specimen’s structure [12].
Krammer: Application of atomic force microscopy to particle sizing, Fresenius’ Journal of Analytical Chemistry 363 (4) (1999) 323– 332
Online since: November 2020
Authors: Priam V. Pillai, Shridhar Sampatrao Deshmukh
These structures are textured from the nano-scale upwards to micro and millimetre scales.
Engineers have tried numerous strategies to mimic these structures and incorporate them into various bio-inspired materials and devices [1].
Synthetic replication of most biological structures is extremely complex and requires a fine balance between nano to micro scale physics, chemistry and engineering.
We can selectively expose different sections of the silicone structure during casting to magnetize only specific sections of the composite.
Fabrication The FFPDMS structures can be prepared by numerous methods [5].
Engineers have tried numerous strategies to mimic these structures and incorporate them into various bio-inspired materials and devices [1].
Synthetic replication of most biological structures is extremely complex and requires a fine balance between nano to micro scale physics, chemistry and engineering.
We can selectively expose different sections of the silicone structure during casting to magnetize only specific sections of the composite.
Fabrication The FFPDMS structures can be prepared by numerous methods [5].
Online since: July 2020
Authors: Takayuki Kawamata, Retno Asih, Malik Anjelh Baqiya, Fahmi Astuti, Isao Watanabe, Takashi Noji, Masatsune Kato, Darminto Darminto, Vera Laviara Maghfirohtuzzoimah, Novita Sari, Hidetaka Sato, Deril Ristiani, Dita Puspita Sari
SEM image of palmyra sugar heated at 250oC
The thick flakes-like structure, observed from the SEM image, are visible.
As shown in Fig. 2, the structure of flakes is not homogeneous since big and small flakes as also reported in Ref [18,19] are observed.
The major element of carbon and flakes with the non-homogenous structure are confirmed from SEM-EDX measurement.
Esquinazi, R.Höhne, Magnetism in carbon structures, J.
Zu, Synthesis of graphene from biomass: A green chemistry approach, Mater.
As shown in Fig. 2, the structure of flakes is not homogeneous since big and small flakes as also reported in Ref [18,19] are observed.
The major element of carbon and flakes with the non-homogenous structure are confirmed from SEM-EDX measurement.
Esquinazi, R.Höhne, Magnetism in carbon structures, J.
Zu, Synthesis of graphene from biomass: A green chemistry approach, Mater.
Online since: November 2016
Authors: Alan Christie Silva Dantas, Andrea de Vasconcelos Ferraz, Nelson C. Olivier, Geciane A. Santos, Amanda A. Barbosa
The production of porous three-dimensional structure of HA and its physical and mechanical characterization were the objectives of this work.
Polystyrene, PS granules with a average diameter of 1 mm was evaluated on its physical structure.
Bands at 1625, 3556 e 3612 cm-1 can be referred to (O-H) groups and are attributed to the crystalline water molecules of the calcium sulfate hemihydrate structure.
Absorption bands at 3100-3560 cm-1 are related to the OH--groups present on the HA structure.
:Materials Chemistry and Physics Vol. 117 (2009), p. 86
Polystyrene, PS granules with a average diameter of 1 mm was evaluated on its physical structure.
Bands at 1625, 3556 e 3612 cm-1 can be referred to (O-H) groups and are attributed to the crystalline water molecules of the calcium sulfate hemihydrate structure.
Absorption bands at 3100-3560 cm-1 are related to the OH--groups present on the HA structure.
:Materials Chemistry and Physics Vol. 117 (2009), p. 86
Online since: July 2011
Authors: Zulkhair A. Mansurov, I.V. Tantsereva, A. Tulepova, A.N. Karabalin, I.M. Vongai
As is known the above mentioned complex of the properties of d - elements is largely determined by the peculiarities of their electronic structure and difficult covalent – ionic metallic nature of interatomic interactions [2].
The structure of samples is presented by quite dense structure without pores formed by polycrystalline aggregates with the size of crystals 5-20 μm while the aggregate strength is quite high.
It is at maximum temperature which is developed in SHS systems that the phase and structure formation of the material takes place.
Gubаnоv: Electronic Structure of refractory Carbides and Nitrides of transition metals (Science, Nauka, Моskow, 1990)
Blumenthal: Chemistry of zirconium (Foreign Literature Publishing House, Moscow, 1963).
The structure of samples is presented by quite dense structure without pores formed by polycrystalline aggregates with the size of crystals 5-20 μm while the aggregate strength is quite high.
It is at maximum temperature which is developed in SHS systems that the phase and structure formation of the material takes place.
Gubаnоv: Electronic Structure of refractory Carbides and Nitrides of transition metals (Science, Nauka, Моskow, 1990)
Blumenthal: Chemistry of zirconium (Foreign Literature Publishing House, Moscow, 1963).
Online since: July 2014
Authors: Vyacheslav Ivanovich Sidorov, Irina Vasil'evna Stepina, Ol’ga Aleksandrovna Klyachenkova
Introduction
It is known that the strength and durability of buildings and structures made of wood is primarily determined by its biological persistence.
As the studies performed by American scientists [1] show, the destruction of wood materials and structures is by 50-70% a result of the action of micro-organisms.
As a result, the wooden structures may become unfit for use already after several years of maintenance, so bio-corrosion of wood causes considerable material damage [2].
First the fungi infect the wooden structures contacting the water or the soil ( ground and underground foundations structures, pillars, lower crowns of wooden houses , etc.) [5].
Koteneva IV, VI Sidorov, IA Kotliarov Analysis of modified cellulose by infrared spectroscopy // Chemistry of plant raw materials in 2011.
As the studies performed by American scientists [1] show, the destruction of wood materials and structures is by 50-70% a result of the action of micro-organisms.
As a result, the wooden structures may become unfit for use already after several years of maintenance, so bio-corrosion of wood causes considerable material damage [2].
First the fungi infect the wooden structures contacting the water or the soil ( ground and underground foundations structures, pillars, lower crowns of wooden houses , etc.) [5].
Koteneva IV, VI Sidorov, IA Kotliarov Analysis of modified cellulose by infrared spectroscopy // Chemistry of plant raw materials in 2011.
Online since: July 2015
Authors: Saidatul Shima Jamarib, Suriati Ghazalic, Wan Siti Nadiah Wan Yaacoba
The first attempt of this process was by Bergius in 1913 and has been developed by Professor Antonietti, the director of Department of Colloid Chemistry at the max Planck Institute of Colloids and Interfaces in Golm/Potsdam (MPI) [6].
The absorbency of the SAP will highly depend on the structure of filler used during synthesis.
Figure 2 (c) showed the alignment and porous structure of carbon fiber can be clearly seen if compared to the Figure 2 (a) and 2 (b) which is not well align.
When filler dispersed in SAP, the porous structures bring about and thus increase the surface area and capillary effect of SAP.
Effect of needle-punched felt structure on the mechanical properties of carbon/carbon composites.
The absorbency of the SAP will highly depend on the structure of filler used during synthesis.
Figure 2 (c) showed the alignment and porous structure of carbon fiber can be clearly seen if compared to the Figure 2 (a) and 2 (b) which is not well align.
When filler dispersed in SAP, the porous structures bring about and thus increase the surface area and capillary effect of SAP.
Effect of needle-punched felt structure on the mechanical properties of carbon/carbon composites.
Online since: July 2011
Authors: Guo Zheng, Yuan Yuan Lei, Yu Sun, Yong Zhou
Because of its special properties, AEC can be widely used in cosmetics, detergents, biochemical chemistry, tragacanth, food processing, petroleum industry and other fields, etc [3-4].
After purifying, distilling, concentrating and drying the solution, the yield of SAE9C-Na was calculated and its structure was confirmed by IR.
Structures analysis In order to get further information, the structures of AEO9 and SAE9C-Na were examined by IR, shown in Fig.4 and Fig.5.
But on wetting time, SAE9C-Na was not as good as AEO9, owing to their different unique structure.
And after purification, distillation and drying, its structure was characterized by IR, indicating that the product was the target product SAE9C-Na.
After purifying, distilling, concentrating and drying the solution, the yield of SAE9C-Na was calculated and its structure was confirmed by IR.
Structures analysis In order to get further information, the structures of AEO9 and SAE9C-Na were examined by IR, shown in Fig.4 and Fig.5.
But on wetting time, SAE9C-Na was not as good as AEO9, owing to their different unique structure.
And after purification, distillation and drying, its structure was characterized by IR, indicating that the product was the target product SAE9C-Na.
Online since: May 2004
Authors: Maria Crışan, Victor Fruth, Maria Preda, Maria Zaharescu, S. Preda
Preda
1
1
Institute of Physical Chemistry of Romanian Academy, 202 Splaiul Independentei, Bucharest,
Romania, RO-060022
2
University "Politehnica", 1 - 7 Gh.
The spectra for both Samples 1 and 2 are characteristic for disordered structures.
The pattern of the Sample 1 presents an amorphous structure for the sol-gel powder.
The intensities of the lines indicate a wellcrystallized structure, both for the anatase and boehmite.
A homogeneous and amorphous structure with aggregation tendency and nanosize grains (~5 nm) of the Sample 2 is presented in the Figure 3, a.
The spectra for both Samples 1 and 2 are characteristic for disordered structures.
The pattern of the Sample 1 presents an amorphous structure for the sol-gel powder.
The intensities of the lines indicate a wellcrystallized structure, both for the anatase and boehmite.
A homogeneous and amorphous structure with aggregation tendency and nanosize grains (~5 nm) of the Sample 2 is presented in the Figure 3, a.
Online since: August 2004
Authors: Yoshiaki Kiyanagi, F. Hiraga, Takashi Kamiyama, H. Iwasa
As an
application of the resonance structure of the neutron cross-section, temperature measurement is also
introduced.
Phase transition in the object can be studied by analyzing the structure of Bragg cut-off of the total cross section [4]. 5.
So, it is indicated that material identification would be principally possible by using the structure of the cross-section.
However, the structures of the cross-section data of the experimental ones are little bit smoother than the BNL data.
Ikeda: Neutron resonance absorption spectroscopy on ionic conductor AgI, Journal of physics and chemistry of solids 60, pp.1499- 1502(1999)
Phase transition in the object can be studied by analyzing the structure of Bragg cut-off of the total cross section [4]. 5.
So, it is indicated that material identification would be principally possible by using the structure of the cross-section.
However, the structures of the cross-section data of the experimental ones are little bit smoother than the BNL data.
Ikeda: Neutron resonance absorption spectroscopy on ionic conductor AgI, Journal of physics and chemistry of solids 60, pp.1499- 1502(1999)